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CSME 2023/12
Volume 44 No.6
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523-532
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Enhanced Microwave Absorption in Salisbury Screen Absorbers by Incorporating Hybrid Reduced Graphene Oxide Papers
Hsien-Kuang Liua, You-Jyun Wua and Ruey-Bin Yangb
aDepartment of Mechanical and Computer Aided Engineering, Feng Chia University, Taichung 40724, Taiwan, R.O.C.
bDepartment of Aerospace and Systems Engineering, Feng Chia University, Taichung 40724, Taiwan, R.O.C.
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Abstract:
An innovative hybrid RGO/GO (reduced graphene oxide/graphene oxide) papers, HGOP incorporated in Salisbury screen absorbers are successfully demonstrated. Compared with reduced graphene oxide papers RGOP, HGOP possesses tunable RGO/GO ratio such that several advantages are achieved including better impedance matching between air and HGOP and creation of more loss mechanisms. For fabricating HGOP, important processing parameters include RGO/GO weight fraction in suspension, sonication time for suspension, and thickness of HGOP. For RGO/GO of 1.5 wt%, sonication time of 10 min, HGOP thickness of 0.5 mm, and air spacer thickness of 3.16 mm, the HGOP15‒T10‒TH5‒AS3 radar absorbing structure (RAS) has attained superior reflection loss (RL) of ‒ 49.1 dB at 10.6 GHz with ‒10 dB bandwidth of 3.9 GHz. To analyze major loss mechanisms caused by this RAS, scanning electron microscope (SEM) micrographs of various HGOP are carefully examined. Functional groups and interaction of RGO/GO are found to be effective for loss mechanisms. Better microwave absorbing properties can be attributed to multiple loss mechanisms of the HGOP and the destructive interference mechanism.
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Keywords: hybrid, reduced graphene oxide paper, weight fraction, sonication time
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©
2023
CSME , ISSN 0257-9731
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